
Zero Delta smelt were found in the fall 2019 CDFW midwater trawl throughout the Delta.
The Delta smelt, once the most abundant species on the Sacramento-San Joaquin River Delta, continues its long slide towards extinction. For the second year in a row, the California Department of Fish and Wildlife in its annual fall midwater trawl survey in 2019 found zero Delta smelt during the months of September, October, November, and December.
Found only in the San Francisco Bay-Delta Estuary, the smelt is an indicator species that shows the health of the ecosystem. Decades of water exports and environmental degradation under the state and federal governments have brought the smelt to the edge of extinction.
In spite of portraying their administrations as green, Governors Arnold Schwarzenegger, Jerry Brown, and Gavin Newsom did nothing to reverse the slide towards extinction.
Meanwhile, the Trump administration recently finalized a plan that threatens the Delta smelt, salmon, and other fish species even more than they already are by maximizing Delta water exports to corporate agribusiness interests in the San Joaquin Valley.
While the CDFW has not yet issued its annual memo analyzing the fall survey results, James White, CDFW Environmental Scientist, wrote in a memo about the September and October 2019 surveys:
No Delta Smelt were collected at index stations in September or October. The 2019 September-October index (0) is tied with 2016 and 2018 as the lowest index in FMWT history. No Delta Smelt were collected at non-index stations during September or October.
A few smelt have turned up in other surveys on the Delta, but they also confirm the fish’s dramatic decline.
This low index is consistent with sampling by other monitoring surveys in fall of 2019, wrote White. Delta Smelt were collected by USFWS Chipps Island Trawl in September (n=2) and not in October (n=0). USFWS Enhanced Delta Smelt Monitoring collected Delta Sm.